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x in (-oo:+oo)
x^(3/7)-7^(1/3) = 3^(1/7) // - 3^(1/7)
x^(3/7)-7^(1/3)-3^(1/7) = 0
1*x^(3/7) = 3^(1/7)+7^(1/3) // : 1
x^(3/7) = 3^(1/7)+7^(1/3)
x^(3/7) = 3^(1/7)+7^(1/3) // ^ 7
x^3 = (3^(1/7)+7^(1/3))^7 // ^ 1/3
x = (3^(1/7)+7^(1/3))^(7/3)
x = (3^(1/7)+7^(1/3))^(7/3)
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